linux-kernel - Re: [PATCH v1] ARM: A9: Add ARM ERRATA 764319 workaround

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Message-ID: <EA4DD6D7-4A9A-41E1-ABE3-B1F3A60D973E@hpe.com>
Date:   Wed, 11 May 2022 12:59:27 +0000
From:   "Verdun, Jean-Marie" <verdun@....com>
To:     Arnd Bergmann <arnd@...db.de>,
        "Hawkins, Nick" <nick.hawkins@....com>
CC:     Will Deacon <will@...nel.org>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Mark Rutland <mark.rutland@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Joel Stanley <joel@....id.au>
Subject: Re: [PATCH v1] ARM: A9: Add ARM ERRATA 764319 workaround

Hi Arnd,

>    If it doesn't work, then there is no point trying. You could try
>    changing the exception
>    handling so it searches the ex_table for Undefined Instruction
>    exceptions as well,
>    but that's probably more complicated.

I looked yesterday evening and share Will's point of view, I don't 
really see how it could work and believe unfortunately that 
we have to stay with the undef_hook approach. Let's us know if 
you believe some improvements are required to the current patch.

Let's see the positive aspect we learnt something, and if we have
to face additional issue, we have that option open.

Side question: Does any of you will attend Open Source Summit North America ?
I will be there with Nick and HPE team to introduce our GXP Asic during a couple
of talks. Would be great if we could spend some time together.

vejmarie

>           Arnd